• Language:
  Home — Products  Overhead & Cable Line Fault Indicator DJX-FF-C Cable Line Fault Indicator

DJX-FF-C Cable Line Fault Indicator

The DJX-FF-C Cable Line Fault Detector is used in 6~35KV Cable line power distribution networks, usually installed in Ring Main Unit, Cable Distribution Box, Switch Cabinet, enable the electricity distribution network engineers to quickly identify the faulty section of network and restore power supplies to customers on healthy sections in the shortest time possible. 
Contact Supplier Chat Online |
  • Overview
  • Datasheet
  • Download
  • Solutions
  • Related products
Main Technical Parameter for Cable Line Fault Indicator:
  • Short Circuit Warning Current: 200-2000A Selectable (accuracy:±10%); Delay 20-300ms; Customer could select before production; Default Settings: 800A/20ms
  • Earth Fault Warning Current: 10-150A Selectable (accuracy:±10%); Delay 20-300ms; Customer could select before production; Default Settings: 20A/20ms 
  • Short circuit sensor mounted cable diameter: outside diameter≤Φ40mm (other specifications shall be customized) 
  • Earth fault sensor mounted cable diameter: outside diameter≤Φ120mm (other specifications shall be customized) 
  • Working Ambient Temperature: -40℃-75℃   
  • Relative Humidity: ≤95%RH  
  • Working Power Supply: The sensors are powered by the CT when the flowing current above 10A, when the current under 10 A, will powered by the backup Lithium battery; The display unit is powered by the Lithium Battery
  • Remote Signal Communication Reset Method: Manual reset / Auto reset 
  • Automatic Reset Time: 1-48H Selectable (accuracy:±1%); Customer could select before production; Default Settings: 12H 
  • Suitable for medium voltage below 35KV rating system.

System Composition
The system of the earth fault locator is composed of 3 pcs short circuit sensor, 1 pcs earth fault sensor, and 1 pcs Display Unit.
 
Sensor 
4pcs/SET, include 3 pcs short circuit sensors and 1 pcs earth fault sensor. 3 pcs short circuit sensors respectively installed in A,B,C three phase Cable Line, 1 pcs earth fault sensor installed on the bifurcation unshielded part of three-phase cable.
 
Display Unit
Receive fault signal from sensors and display immediately as light flashing. The sensors and the display unit of the cable fault indicator is connected by the fiber optic.

Operation worked example
 
Short circuit indication:  
On detection of flowing current value exceed the fault sensitivity threshold, the Short circuit sensor will send fault signal through fiber optic to the Display Unit. The Display Unit of the underground cable fault locator will respond by light flashing in the short circuit indicator. 
 
Earth fault detection:
On detection of the zero sequence current value exceed fault sensitivity threshold, the earth fault sensor will send fault signal through fiber optic to the Display Unit. The Display Unit will respond by light flashing in the Underground Fault Indicators. 
 
Installation
Cable Line Fault Indicator


General
Applicable voltage range
6~35KV (should confirm before production)
Applicable current range 0~630A (should confirm before production)
Applicable power frequency range 45~60Hz (should confirm before production)
MTBF more than 70000H
Impulse current withstand 31.5kA for 2s
Degree of protection IP67
Weight less than 540g
Outline dimension Ф75mm * 115mm

 

EMC
Electrostatic discharge
Can withstand the GB/T 17626.2 of the IV level of electrostatic discharge interference test
Communication discharge: + 8KV
Air discharge: + 15KV
EFT/B immunity test
Can withstand the GB/T 17626.12 of the IV class fast pulse group interference test
Voltage peak value: 2KV
Frequency: 5KHz & 100KHz
Radiated susceptibility Can withstand the GB/T 17626.3 of the IV level RF electromagnetic field immunity
Field strength: 30V/m
Surge immunity
Can withstand the GB/T 17626.5 of the IV level surge (impact) interference test
Common mode voltage: 4KV ± 10%
Differential mode voltage: 2KV ± 10%
Power frequency magnetic field immunity Can withstand the GB/T 17626.8 of the V level power frequency magnetic field immunity interference test
Magnetic field intensity: 100A/m
Damped oscillatory magnetic field immunity Can withstand the GB/T 17626.10 of the V level damping oscillation magnetic field immunity test
Damped oscillatory magnetic field intensity peak value: 100A/m

 

Environmental
Environment temperature Operation temperature: -35℃~80℃(-31~+176℉)
Storage temperature: -40℃~85℃(-40~+185℉)
Relative humidity 5~95%( No condensing)
Altitude ≤4000m